.topbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 80px;
    background-color: #f5f5f5;
    display: flex;
    justify-content: space-around;
    align-items: center;
}

.greeting {
    padding-left: 20%;
    font-size: 20px;
}

.logo img {
    height: 100%;
}

.userimage img {
    height: 50px;
}

.quit button {
    background-color: #A9BBFF;
    border: none;
    color: #000000;
    width: 150px;
    height: 50px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 25px;
    cursor: pointer;
    border-radius: 20px;
}

.quit button:hover {
    background-color: #165EE2;
}


.sidebar {
    text-align: center;
    position: fixed;
    width: 15%;;
    display: flex;
    flex-direction: column;
    justify-content: stretch;
    color: #fff;
    background-color: #677794;
}

.left {
    top: 80px;
    left: 0;
    bottom: 0;
}

.left .item {
    width: 100%;
    height: 121px;
    line-height: 120px;
}

.left .active {
    background-color: #475875;
    width: 100%;
    height: 121px;
    line-height: 120px;
}

.left div:hover {
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}

.right {
    color: #000;
    position: fixed;
    top: 80px;
    right: 0;
    width: 20%;
    height: 100%;
    background-color: #475875;
    transition: right .3s ease-in-out;
    margin-right: 10px;
}

.hot-books {
    background-color: #f5f5f5;
    padding: 0 0 0 20px;
    height: 100%;
    overflow-y: auto;
}

.hot-books h4 {
    text-align: left;
}

.hot-books .title {
    margin-bottom: 10px;
}

.hot-books .list {
    height: 100px;
}

.hot-books .item {
    width: 100%;
    display: flex;
    text-align: left;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 20px;
}

.hot-books .item:hover {
    background-color: #cccccc;
}

.hot-books .book-name {
    font-size: 20px;
}

.hot-books .borrow-info {
    text-align: right;
}

.hot-books .item img {
    width: 60px;
    height: 80px;
    margin-right: 10px;
}

.right .exit {
    color: #fff;
    bottom: 0;
    height: 200px;
    line-height: 70px;
}

.right .exit:hover {
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}

.container {
    position: fixed;
    top: 80px;
    left: 15%;
    right: 20%;
    height: 620px;
    overflow-y: auto;
}